icmp unreachable messages and ping codes

Unanswered Question
Aug 9th, 2009

Hi every body.

My book says when we use ping, we could receive five poossible responses identified by code in the output. For example:

! echo reply received

. nothing was received, ping timed out

U Icmp unreachable( destination )

N icmp unreahable( network)

M can not fragment the packet

? unknown packet received.


Let say we are not using ping, we are using wireshark.

we can capture Icmp messages exchanged between hosts when trouble occurs .

According to book, ICmp unreachable messages can includes fives seperate unreacable codes that further identify why the packet cannot be delivered.

These codes are:

Network unreachable:

host unreacable

Can't fragment

protocol unreachable

port unreachable

what are the alphabitical codes to represent these above messages?

thanks a lot.

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